$01/1: 6510 On-chip 8-bit Input/Output Register
+----------+---------------------------------------------------+
| Bits 7-6 | Undefined |
| Bit 5 | Cassette Motor Control (0 = On, 1 = Off) |
| Bit 4 | Cassette Switch Sense: 1 = Switch Closed |
| Bit 3 | Cassette Data Output Line |
| Bit 2 | /CharEn-Signal (see Memory Configuration) |
| Bit 1 | /HiRam-Signal (see Memory Configuration) |
| Bit 0 | /LoRam-Signal (see Memory Configuration) |
+----------+---------------------------------------------------+
Default Value is $37/55 (%00110111).
(German-?)C128 only:
+--------+-----------------------------------------------------+
| Bit 6 | ASCII/DIN-Switch (0=DIN, 1=ASCII) |
+--------+-----------------------------------------------------+
Default Value is $77/119 (%01110111).
Flash_8 only:
+--------+-----------------------------------------------------+
| Bit 7 | 1 = 1 MHz, 0 = 8 MHz (if DIP1 closed) |
| Bit 6 | (?) |
+--------+-----------------------------------------------------+
Default Value is $37/55 (%00110111).
Kernal-Reference:
ASL $01,X : $B9A6
BIT $01 : $F830 $F834
INC $01,X : $B9AA
LDA $01 : $EA61 $EA6B $EA75 $F8AB $FBBF $FCCA
$01,X : $F5E6
$0001,Y : $B8CB
LDY $01,X : $B991
LSR $01,X : $B89E
ROR $01,X : $B9AC $B9AE
SBC $01,X : $B8CE
STA $01 : $EA79 $F8AF $FBC3 $FCCE $FDD7
$01,X : $B4DB
STY $01,X : $B997
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